German medical journal The Lancethas reported that a 50-year-old man who developed a “chronic subdural haematoma” – which means bleeding in the brain – did so after doing some intense headbanging at a Motörhead concert. The Lancet report defines headbanging as, “a contemporary dance form consisting of abrupt flexion—extension movements of the head to the rhythm of rock music, most commonly seen in the heavy metal genre.”

The man reportedly had no history of brain issues and was healthy, but sought help for a doctor four weeks after headbanging at a Motörhead show in late 2012. The article explains that “health complications attributed to [headbanging] include carotid artery dissection, mediastinal emphysema, whiplash injury, and odontoid fracture.”

“While such shows are enjoyable and stimulating for the audience,” the article warns, “some fans might be endangered by indulging in excessive headbanging.”

The man who suffered from the bleeding brain in the article is doing fine. According to the report, he had a hole drilled in his skull, the blood drained and some more leakage over the course of six days, and then went home and had no further problems.

The article wraps up stating, “This case serves as evidence in support of Motörhead’s reputation as one of the most hardcore rock ‘n’ roll acts on earth, if nothing else because of their contagious speed drive and the hazardous potential for headbanging fans to suffer brain injury.”